300-420 Question #145: Real Exam Question with Answer & Explanation

Question

What is the purpose of a control plane node in a Cisco SD-Access network fabric?

Options

• Ato maintain the endpoint database and mapping between endpoints and edge nodes
• Bto detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node
• Cto identify and authenticate endpoints within the network fabric
• Dto act as the network gateway between the network fabric and outside networks

Explanation

{"question_number": 10, "question": "What is the purpose of a control plane node in a Cisco SD-Access network fabric?", "correct_answer": "A", "explanation": "In Cisco SD-Access, the control plane node runs LISP (Locator/ID Separation Protocol) as a Map Server and Map Resolver. Its primary role is to maintain the host tracking database - a mapping of EIDs (Endpoint Identifiers, which are the client IP and MAC addresses) to their associated fabric edge node (the RLOC, or Routing Locator). When a fabric edge node needs to forward traffic to an endpoint it has not seen before, it queries the control plane node, which responds with the RLOC of the edge node where the destination endpoint resides. Option B describes the function of fabric edge nodes, which detect endpoints and register them with the control plane node. Option C (authentication) is handled by Cisco ISE in conjunction with the policy plane. Option D (gateway to external networks) describes the role of the fabric border node.", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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